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add performance counting mechanism for MRI debug/tuning purpose.

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* How to enable this feature?
  * define USE_DEBUG_COUNTER as 1.
  * you can disable to output the result with
    RUBY_DEBUG_COUNTER_DISABLE environment variable
    even if USE_DEBUG_COUNTER == 1.

* How to add new counter?
  * add COUNTER(<name>) line on debug_counter.h.
  * include "debug_counter.h"
  * insert RB_DEBUG_COUNTER_INC(<name>) line on your favorite place.

* counter output example:
  [RUBY_DEBUG_COUNTER]    mc_inline_hit   999
  [RUBY_DEBUG_COUNTER]    mc_inline_miss  3
  [RUBY_DEBUG_COUNTER]    mc_global_hit   23
  [RUBY_DEBUG_COUNTER]    mc_global_miss  273
  [RUBY_DEBUG_COUNTER]    mc_global_state_miss    3
  [RUBY_DEBUG_COUNTER]    mc_class_serial_miss    0
  [RUBY_DEBUG_COUNTER]    mc_cme_complement       0
  [RUBY_DEBUG_COUNTER]    mc_cme_complement_hit   0
  [RUBY_DEBUG_COUNTER]    mc_search_super 1384
  [RUBY_DEBUG_COUNTER]    ivar_get_hit    0
  [RUBY_DEBUG_COUNTER]    ivar_get_miss   0
  [RUBY_DEBUG_COUNTER]    ivar_set_hit    0
  [RUBY_DEBUG_COUNTER]    ivar_set_miss   0
  [RUBY_DEBUG_COUNTER]    ivar_get        431
  [RUBY_DEBUG_COUNTER]    ivar_set        465

  * mc_... is related to method caching.
  * ivar_... is related to instance variable accesses.

* compare with dtrace/system tap features, there are completely
  no performacne penalties when it is disabled.

* This feature is supported only on __GNUC__ compilers.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57676 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
ko1 2017-02-21 08:18:15 +00:00
parent 51de3aa2b2
commit 76c4cca19c
7 changed files with 145 additions and 3 deletions
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39
debug_counter.c Normal file
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@ -0,0 +1,39 @@
/**********************************************************************
debug_counter.c -
created at: Tue Feb 21 16:51:18 2017
Copyright (C) 2017 Koichi Sasada
**********************************************************************/
#include "debug_counter.h"
#include <stdio.h>
#if USE_DEBUG_COUNTER
/* do not modify manually. use a script above */
const char * const debug_counter_names[] = {
#include "debug_counter_names.inc"
""
};
size_t rb_debug_counter[RB_DEBUG_COUNTER_MAX + 1];
__attribute__((destructor))
static void
rb_debug_counter_show_results(void)
{
const char *env = getenv("RUBY_DEBUG_COUNTER_DISABLE");
if (env == NULL || strcmp("1", env) != 0) {
int i;
for (i=0; i<RB_DEBUG_COUNTER_MAX; i++) {
fprintf(stderr, "[RUBY_DEBUG_COUNTER]\t%s\t%"PRIuSIZE"\n",
debug_counter_names[i],
rb_debug_counter[i]);
}
}
}
#endif /* USE_DEBUG_COUNTER */